Switzerland

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Argentina's Diego Sebastian Schwartzman returns the ball during the second round match of the French Open tennis tournament against Switzerland's Roger Federer at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/Darko Vojinovic)

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Switzerland's Roger Federer returns the ball during the second round match of the French Open tennis tournament against Argentina's Diego Sebastian Schwartzman at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/Darko Vojinovic)

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Switzerland's Roger Federer returns the ball during the second round match of the French Open tennis tournament against Argentina's Diego Sebastian Schwartzman at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/Darko Vojinovic)

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Switzerland's Roger Federer serves the ball during the second round match of the French Open tennis tournament against Argentina's Diego Sebastian Schwartzman at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/Darko Vojinovic)

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Switzerland's Stanislas Wawrinka greets Spain's Guillermo Garcia-Lopez, left, after losing the first round match of the French Open tennis tournament in four sets at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)